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Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail) $ / mwh in Millions, $ / Derivative in Millions, $ / DTH in Millions | 6 Months Ended
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Jun. 30, 2017 $ / mwh $ / Derivative $ / DTH | Jun. 30, 2016 $ / mwh $ / Derivative $ / DTH
Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 321 | 357
Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 349 | 323
FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 6 | 9
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative | 500 | 500
PSEG [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 0 | 0
PSEG [Member] | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 0 | 0
PSEG [Member] | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 0 | 0
PSEG [Member] | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative | 500 | 500
Power [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 321 | 348
Power [Member] | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 349 | 323
Power [Member] | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 6 | 9
Power [Member] | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative | 0 | 0
PSE And G [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 0 | 9
PSE And G [Member] | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 0 | 0
PSE And G [Member] | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 0 | 0
PSE And G [Member] | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative | 0 | 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract but not the derivative contract itself. + References No definition available. + Details
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